My opinion the sex was a way to pass something like an STD. I think the doctor (as I don't have season four on DVD yet can't say for sure) the those cones were swelled as if there was a infection. Someone may correct this but that's how I remember the episode. As Nick wasn't going to have sex with Adalind to be infected she had to change to Juliette to transmit the STD causing the infection effect on those cones. We know Adalind can make a potions just to do one thing like Juliette memory of Nick.
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